Technical information

7
The advantages of P
O
WERBAL
L
®
tec
h
no
l
ogy compare
d
to cy
li
n
d
r
i
ca
l
so
l
ut
i
ons
• Better maintained luminous
f
lux throu
g
hout the service li
f
e
•
I
mprove
d
co
l
or ren
d
er
i
n
g
, part
i
cu
l
ar
l
y
i
n t
h
e re
d
• Improved color stability durin
g
the service li
fe
• More uni
f
orm operation independent o
f
burnin
g
positio
n
• More constant luminous intensit
y
distributio
n
•
F
aster start-u
p
b
e
h
av
i
o
r
Fi
g
. 3:
C
omparison of ceramic corrosion between the different tube forms
9000 h
Convection
Deposition of alumina
by saturation of HM-melt
due to cooling
Condensation
of Metall Halides
Evaporation
of Metal Halides
Evaporation
of Metal Halides
Convection
Solution of
Alumina
in MH-melt
= Corrosion
Transport of
soluble
alumina in
MH-melt
Conden-
sation of
Metal Halides
1100
1060
1020
980
940
12000 h